Carburetor and dash pot control therefor

ABSTRACT

A motor vehicle carburetor in which an arcuate swinging throttle valve controls the venturi throats and multi-apertured fuel nozzle overlies the valve with the fuel flowing therefrom due to the suction of air flowing thereby. The apertures are arranged so that air flows by the greatest number with the valve completely open and as the valve closes, air is prevented from flowing by successive apertures in the nozzle to prevent gas from being pulled therethrough by the flow of air. The feed mechanism for feeding gasoline from the gas tank to the nozzles is conventional. The carburetor throttle valve is controlled by a standard foot feed having a dash dot interposed in the linkage to effect a slight time delay in the opening of the throttle valve when the foot feed is suddenly depressed to its fullest extent.

O United States Patent [151 3,682,449 Severn [4 1 Aug. 8, 1972 [54] CARBURETOR AND DASH POT 497,614 12/1919 France ..261/62 CONTROL THEREFOR 639,821 3/1962 ltaly ..261/62 [72] Inventor: Alpha Severn, Sacramento, Calif.

[73] Assignees: James A. Coon; Elwin Theobald, Primary Examiner--Tim R. Miles part interest to each Attorney-Alexander B. Blair [22] Filed: March 11, 1970 [21] Appl. No.: 18,424 [57] ABSTRACT A motor vehicle carburetor in which an arcuate swing- [52] US. Cl. ..261/23 A, 261/62 ing throttle valve controls the venturi throats and [51] Int. Cl ..F02m 1l/08 multi-apertured fuel nozzle overlies the valve with the [58] Field of Search ..261/41 B, 62, 23 A fuel flowing therefrom due to the suction of air flowing thereby. The apertures are arranged so that air [56] References Cited flows by the greatest number with the valve completely open and as the valve closes, air is prevented from UNITED STATES PATENTS flowing by successive apertures in the nozzle to 2,655,357 10/1953 Steffen ..261/62X prevent gas from being pulled therethrough by the 2,547,873 4/1951 Kittler ..261/62 flow of air. The feed mechanism for feeding gasoline 3,342,464 9/1967 Mick ..261/50 A from the gas tank to the nozzles is conventional. 1,251,623 l/ 1918 Baverey ..261/62 The carburetor throttle valve is controlled by a stan 1,162,308 11/1915 Pond ..261/4113 dard foot feed having a dash dot interposed in the 1,183,222 5/1916 Miller ..261/41 B 2 029 666 2,1936 Markwan 261/62 linkage to effect a slight time delay in the opening of 3l82974 5/1965 Hill I50 A the throttle valve when the foot feed is suddenly depmssed to its fullest extent.

FOREIGN PATENTS OR APPLICATIONS 17,386 6/ 1913 France ..261/62 1 Claim, 4 Drawing Figures /5 2/ l9 1, 1 1 I l 22 l6 Z6 f 24 PATIENTEUAus 8 m2 sum 1 or 2 F761 2 41pm Y PATENTEB 31972 3,682,449

SHEET 2 OF 2 Q a d INVENTOR.

41pm Sim/2A CARBURETOR AND DASH POT CONTROL THEREFOR BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to internal combustion engine carburetors of the type which utilizes the flow of air therethrough to entrain and vaporize liquid gasoline fed into the air stream.

2. Summary of the Invention The present invention relates to a carburetor for an internal combustion engine of the type in which a flow of air through the carburetor entrains and vaporizes gasoline which is fed into the air stream by venturi action of the air. A swinging arcuate throttle valve progressively opens the air passage and progressively permits flow of air across a succession of apertures in a fuel nozzle so that the wider open the throttle valve the greater number of apertures are affected by the flow of air and the more fuel that is available for entraining and vaporizing in the air stream.

A dash pot control for the throttle valve prevents the carburetor from being abruptly completely open with the resulting waste of gasoline and the expelling of noxious fumes which occurs when the carburetor is suddenly fully opened.

The primary object of the invention is to provide a carburetor in which the fuel supply is automatically varied with the air supply under control of the throttle valve setting.

Another object of the invention is to provide a dash pot connection in the foot control linkage of the carburetor to prevent the sudden opening of the throttle valve.

Other objects and advantages will become apparent in the following specification when considered in light of the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top plan view of the carburetor with top removed;

FIG. 2 is a vertical sectional view taken along the line 2--2 of FIG. 1 looking in the direction of the arrows;

FIG. 3 is a vertical sectional view of the dash pot control; and

FIG. 4 is a horizontal section taken along the line 4- 4 of FIG. 3 looking in the direction of the arrows.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings in detail wherein like reference characters indicate like parts throughout the several figures the reference numeral indicates generally a carburetor for internal combustion engines constructed in accordance with the invention.

The carburetor 10 includes a body 11 having a float chamber 12 in which a float 13 controls the level of gasoline in a conventional manner. Adjacent the float chamber 12 is a vertical throat 14 extending completely through the body 11. The body 11 is adapted to be supported on and connected on the intake manifold of an internal combustion engine in a conventional manner.

An arcuate plate 15 is mounted in the body 11 overlaying the throat 14 and is provided with a pair of oppositely disposed circular openings 16, 17 forming venturis through which all of the air flows on its passage through the throat 14. A fuel feed chamber 18 is positioned between the float chamber 12 and the throat l4 and receives fuel from the throat chamber 12 in a conventional manner. A pair of fuel feed nozzles 19, 20 are connected to the fuel feed chamber 15 and extend outwardly therefrom centrally of the circular venturi openings 16, 17 respectively in overlying relation with respect thereto. The nozzles 19, 20 lie slightly above the arcuate plate 15 as can be seen in FIG. 2. Each of the males 19, 20 are tubular and are closed at 21, their outer ends. A plurality of apertures 22 are formed in the underside of each of the nozzles 19, 20 spaced longitudinally thereof. Gasoline from the feed chamber 18 feeds into the nozzles 19, 20 normally providing a supply of gasoline therein. The apertures 22 are of the size so that gasoline will flow therethrough only upon flow of air through the venturi openings 16, 17 which will asperate gasoline through the apertures 22 over which the air is flowing.

A horizontal throttle shaft 23 extends through the body 11 centrally of the throat 14 and is connected to the throttle linkage generally indicated at L under control of the foot feed of the conventional motor vehicle. The throttle shaft 23 has a pair of spaced apart parallel posts 24, 25 extending perpendicularly upwardly therefrom. An arcuate generally rectangular throttle valve 26 is secured to the upper ends of the posts 24, 25 for swinging movement across the arcuate plate 15 into a position obstructing the venturi opening 16. A second pair of spaced apart parallel posts 27, 28 are secured to the shaft 23 and extend perpendicularly upwardly therefrom in aligned relation to the posts 24, 25. An arcuate generally rectangular throttle valve 29 is mounted on the upper ends of the posts 27, 28 for swinging movement adjacent the plate 15 to a position obstructing the venturi opening 17.

In the operation of the carburetor 10, the throttle valves 26, 29 are initially in a position not quite closing the venturi openings 16, 17 and in this position one of the apertures 22 in each of the nozzles 19, 20 lies in the path of air flowing through the venturi openings 16, 17 With this. relationship gasoline is only asperated through the single exposed aperture 22 in each nozzle 19, 20 and aminimal amount of gasoline is fed to the engine. As the throttle valves 26, 29 are swung on the shaft 23 to open more of the venturi openings l6, 17 to permit a greater quantity of air to flow therethrough additional apertures 22 come into the path of the flowing air and gasoline is asperated from each of the apertures 22 over which the flowing air passes.

As the throttle valves 26, 29 are completely opened all apertures 22 of the nozzles 19, 20 are in the path of the flowing air and gasoline flows through each of the apertures 22 to provide sufficient gasoline for high speed operations.

Conventional high and low speed jets are not required in the carburetor 10 and the transition from a single aperture 22 to dual apertures 22 is much smoother than the transition from low to high speed jets in conventional carburetors. It should be noted that the nozzles 19, 20 are positioned centrally of the venturi openings 16, 17 and hence the gasoline flows into the middle of the air stream passing therethrough for better mixing and atomization. In FIGS. 3 and 4 a dash pot throttle control is indicated generally at 40.

The dash pot throttle control 40 includes a cylindrical chamber 41 having a circular removable cover 42 on its upper end. A vertical piston rod 43 extends centrally through the cover 42 and has a circular piston 44 secured to its lower end. The piston 44 has a relatively small passage 45 formed in one side thereof and a relatively large circular passage 46 formed in the other side thereof. A neoprene circular valve 47 is positioned under the opening 46 and is adapted to reciprocate vertically to a position closing the opening 46. A plurality of guide pins 48 depend from the piston 43 to retain the valve 47 in vertical alignment. A valve stem 49 is connected centrally to the valve 47 and extends upwardly through the opening 46 and has a resilient locking pin 50 detachably secured to its upper end and engaging the upper surface of the piston 44 to hold the valve 47 in its position underlying the opening 46. As the piston 44 moves downwardly in the chamber 41 at a slow pace, oil will flow around the valve 47 through the opening 46 and will also flow through the opening 45 from below the piston 44 to above the piston 44. If the movement of the piston 44 downwardly in the chamber 41 is sudden, the valve 47 is caused to move upwardly against the bottom of the opening 46 sealing the opening 46 and all oil must then pass through the relatively small opening 45. This completely prevents the piston 43 from moving quickly downwardly in the chamber 41. The return of the piston 44 upwardly in the chamber 41 is not restricted since the valve 47 will drop away from the opening 46 as soon as downward movement of the piston 44 ceases and when upward movement occurs oil can flow downwardly through both of the openings 45 and 46 permitting the piston 44 to return to an upper position without restraint.

The dash pot 40 is connected to the linkage L of the carburetor 10 by conventional means. As can be seen 7 in FIG. 3, a link 51 extends from the foot feed of the conventional motor vehicle and moves to the right of ment of the link 51 will cause the bell crank lever 52 to rotate on its pivot 53 counter clockwise and through the spring 59 will cause the bell crank lever 55 to rotate clockwise. This movement will cause the piston rod 43 to be moved downwardly in the chamber 41 and if the movement of the link 51 is sudden the piston 44 will resist the movement as described above and the spring 59 will stretch maintaining tension on the bell crank 55 so that the piston 44 will move downwardly in the chamber 41 as fast as the escape of oil through the opening 45 will permit. A link 60 extends from the bell crank lever 55 to the carburetor throttle control so that the throttle control will be moved as rapidly as the bell crank lever 55 is moved under the retardation of the piston 44.

The function of the dash pot 40 is to prevent the exaaii e a sss g sd it so as? Meters 40 connected to the carburetor the operation of the motor vehicle is smooth and more economical.

Having thus described the preferred embodiment of the invention it should be understood that numerous structural modifications and adaptations may be resorted to without departing from the spirit of the invention.

What is claimed is:

l. A carburetor fuel feed comprising a carburetor body, an air passage extending through said body, an air venturi in said air passage, a tubular fuel nozzle extending into said air passage immediate above and across said venturi, a plurality of fuel apertures formed in the lower side of said nozzle, a semi-cylindrical throttle valve positioned beneath and across said venturi from a position substantially closing said venturi and limiting the flow of air therethrough so as to pass over one of said apertures to a position substantially opening said venturi and permitting the passage of air past all of said apertures, said air venturi being formed in a semicylindrical arcuate plate mounted in said body and said throttle valve being mounted to swing across said plate to a position obstructing said air venturi, a throttle shaft extending horizontally through said body underlying said venturi, a pair of posts projecting perpendicularly upwardly from said throttle shaft in spaced parallel relation with said throttle valve being secured to the upper end of said posts to provide the mounting for swinging movement of said valve. 

1. A carburetor fuel feed comprising a carburetor body, an air passage extending through said body, an air venturi in said air passage, a tubular fuel nozzle extending into said air passage immediate above and across said venturi, a plurality of fuel apertures formed in the lower side of said nozzle, a semicylindrical thrOttle valve positioned beneath and across said venturi from a position substantially closing said venturi and limiting the flow of air therethrough so as to pass over one of said apertures to a position substantially opening said venturi and permitting the passage of air past all of said apertures, said air venturi being formed in a semi-cylindrical arcuate plate mounted in said body and said throttle valve being mounted to swing across said plate to a position obstructing said air venturi, a throttle shaft extending horizontally through said body underlying said venturi, a pair of posts projecting perpendicularly upwardly from said throttle shaft in spaced parallel relation with said throttle valve being secured to the upper end of said posts to provide the mounting for swinging movement of said valve. 